Support for streaming outputs

[prabhakk-mw]

Details of the feature

Consider the snippet:

for m=1:3
pause(3)
m
end

It is expected for the outputs from this execution to print a numbers every 3 seconds.

Currently, all the outputs from the result of execution are displayed after 9 seconds.

The request is for a way to either configure this behavior to stream results as they are available, or if possible make it the default.

[prabhakk-mw]

Based on requests from @fcyang58 in #101